Relationship Between SPCC 1.0 & FEMA National Flood Hazard Layer

Analysis Overview

This analysis quantifies relationships between SPCC 1.0 Refined Smoothed Roadway Segments and flood hazard areas identified in FEMA’s Flood Insurance Rate Map (FIRM). For this analysis, FIRM GIS data for the state of Florida were obtained from the FGDL data repository in March 2021. This analysis identified the floodplain of each roadway segment using the roadway centerline’s relationship to FIRM polygons.

Mapping

SPCC 1.0 Segments by Floodplain Designation

Tables and Charts

Floodplain Designations by SPCC 1.0 Refined Smoothed Classification

The following table and charts present the presence of the five FEMA floodplain classifications for each SPCC 1.0 Refined Smoothed classification.

SPCC 1.0	100-Year Floodplain	500-Year Floodplain	Open Water	Outside Floodplain	Undetermined
C1 - Natural	578,930	29,462	1,225	1,286,851	304,946
C2 - Rural	547,684	50,376	NA	2,000,444	105,457
C3C- Suburban Commercial	375,450	306,268	NA	1,817,626	NA
C3R - Suburban Residential	913,531	1,002,877	NA	4,578,678	62,882
C4 - Urban General	963,239	1,795,710	NA	3,401,447	NA
C5 - Urban Center	33,538	38,217	NA	56,099	NA
C6 - Urban Core	28,926	24,474	NA	27,932	NA
Special District	15,231	7,362	NA	46,193	NA

The following table presents the same data as above, but instead of absolute linear feet of roadway per quantile, the table provides the percent breakdown of all floodplain classifications across each SPCC category.

SPCC 1.0	0-Vehicle Household Density Quantile - Percent
SPCC 1.0	100-Year Floodplain	500-Year Floodplain	Open Water	Outside Floodplain	Undetermined
C1 - Natural	26.3%	1.3%	0.1%	58.5%	13.9%
C2 - Rural	20.3%	1.9%	NA	74.0%	3.9%
C3C- Suburban Commercial	15.0%	12.3%	NA	72.7%	NA
C3R - Suburban Residential	13.9%	15.3%	NA	69.8%	1.0%
C4 - Urban General	15.6%	29.1%	NA	55.2%	NA
C5 - Urban Center	26.2%	29.9%	NA	43.9%	NA
C6 - Urban Core	35.6%	30.1%	NA	34.3%	NA
Special District	22.1%	10.7%	NA	67.2%	NA